Plow



Aug; 27, 1935. c. G. STRANDLUND 2,012,458

FLOW

Original Filed July I5, 1955 6 Sheets-Sheet l Ln ma O m in J m O D 6 l QE,

VVA/YN Aug. 27, 1935. C. G. sTRANDLUND 2,012,458 l PLOW Original FilledJuly 3, 1933 6 Sheets-Sheet 2 lil /N'VENTOR WIT/V555. @L l z (Mw. lATYTORNEYS.

Aug- 27, 1935. c. G. STRANDLUND 2,012,458

` PLOW original Filed July 3, 1953 s sheets-'sheet s Z] 1N VNTO'R l l BYWWA/555. i3/ww, mq@

, Abu/0L A TTORNE VS.

C. G. STRANDLUN'D ufg. 2?, w35.

PLOW

Original Filed July 5, 1935 6 Sheets-Sheet 4 I N V EN TOR ma f ATTORNEYS.

W/ TNESS.

Aug. 27, 1935.

C. G. STRANDLUND PLOW Original Filed July 5, 1933 G Sheets-Sheet 5 /m,MEN m INVENTOR 'LY ATTORNEYS.

Aug. 27,1935. Cl G, STRANDLUND 2,012,458

PLOW

Original Filed July 5, 1933 6 Sheets-Sheet 6 ze A 2bn-Law. l ATTORNEYS.Y

- Patented Aug. l27, 1935 PATENT OFFICE PLOW Carl G. Strandlund, Moline,Ill., assignor to Deere & Company, Moline, Il l.,va corporation of Illi-IlOlS Application July 3, 1933, Serial No. 678,754 Renewed May 16, 1935g 21 Claims.

The present invention relates generally to agricultural implements andis particularly concerned with the provision of an improved twowaytractor plow having novel lifting connections" by which either plow unitmay be lowered independently of the other and novel means for loclgingthe plow in raised position so that it is maintained out of the way ofthe plow in lowered position. In its more generic aspects, the presioent invention contemplates improved connections adapted for anyimplement embodying a tool unit or units which are shiftable fromoperative to inoperative position with means for locking or holding theunit in its inoperative position.

i@ Another object of theA present invention is the provision of improvedmeans connecting the tool units to their supporting frame in such amanner that the transmission of draft to the tool in its operative orworking position is not interfered 2p with but the connecting means isso constructed and arranged that when the tool unit is shifted to itsinoperative position, the tool unit is at the same time moved to a givenor predetermined position. u

More specifically, it is the purpose of the prescnt invention toprovidea two-way plow having spring means for transmitting the draft from thctractor or other wheeled frame supporting the plow units to said units,which spring means 3@ is given a definite bias which is effective toshift thc plow in raised position to one side of the tractor out of theway of the plow in working position. The bias of such spring means issuch that the lateral deviations ofthe unit in operating position is notmaterially restrained. These connections preferably include a pair oflaterally spaced compression springs or the equivalent for each of theplow units, one of the spring means being made relatively strong andpositioned adjacent the center of the tractor or wheeled sup.-

porting frame to transmit the pulling load while the other spring meansis made relatively weak to permit a certain amount of lateral swingingmovement of the plow with respect to its supporting frame but which issufficiently strong to prevent lateral swinging of the plow when in.raised position.

Another object of the present invention is the provision ofimprived-lifting and adjusting mechanism for implement units and thelike, such as those carried by a tractor and connected with the draw barthereof. According to the principles of the present invention, the novelconnections include a rock shaft or the equivalent carried by thetractor andV operatively connected to rock the tractor draw bar toadjust the height of hitch for the tools, such rock shaft alsosupporting at least a portion of the connections which are operative t oraise and lower the tools. gl

These and other objects and advantages of 'the present invention will beapparent to those skilled in the art after a consideration of thcfollowing detailed description of thc preferred construction, taken inconjunction with the ac- )lil companying drawings forming a part of thespecification.

In the drawings:

Figure l is a fragmentary side elevation with certain parts removed andshowing the applicala tion of the present invention to a tractorpropelled two-way plow, one of the plow units being in elevated positionwhile the other plow unit is in' working or ground engaging position;

Figure 2 is a top plan view of the machine il- 20,

lustrated in Figure l;

Figure 3 is an enlarged side elevation showing the lifting connectionsas they appear when the plow unit associated therewith is in its raisedor inoperative position; 25

Figure 4 is a View similar to Figure 3 but illus trating the position ofthe parts when the plow unit is in working position;

Figure 5 isa section taken along the line 5 5 of Figure 3 30 Figure 6 isa top planview of a modified form of the present invention, illustratingthe principles of the present invention as embodied in slightlydifferent draft and lifting connections;

Figure 'l is a side elevation of the machine il- 35 lustrated in Figure6;

Figure 8 is a, vertical view, partly in section and partly in elevation,illustrating the manner in which a portion of the height adjustingconnections are utilized as a bearing for the connections 40 utilized inraising the plow units to inoperative position; v

Figures 9 and 10 illustrate two positions of the lifting connectionsandthe associated toggle lock mechanism; v 45 Figure 11 is a,fragmentary elevation, illustrating the pivotal supporting means for thedraw bar to which the tool beams and plow units are connected, theheight of hitch for the tool beams being adjusted by rocking the drawbar; and` 50 Figure 12 is a section taken along the line |2-l2 of Figure11.

Referring now to the drawings, the preferred form of the invention isillustrated in Figures 1 u to 5, inclusive, from which it will beobserved that the present invention is a. two-way plow. Twoway plows areespecially adapted to plow hilly fields, irregular fields and irrigatedfields that must be kept level for proper regulation of water 110W inthe ditches. In using two-way plows, the operator starts on one side ofthe 'eld and plows back and yforth until the field is finished, firstusing one of the plow units and then the other, thus eliminating deadfurrows and back ridges. The two-way plows include two complete plowbottonis` or units, one left hand and one right hand, as is wellunderstood in the art. Two-way plows are well known in the art and itisto be further understood that the principles of the present inventionare equally applicable to other formsof agriculturalimpiements includingmov- 'ably mounted soil engaging or operating units,

shiftable into and outof operative position. It will therefore beunderstood that the present invention and the teachings thereof may beutilized in implements other than plows or the like.

The two-way plow illustrated in the drawings is ofthe type adapted to beattached to and carried by a wheeled supporting frame in the form of atractor of more `or less conventional construction, the plow being inthe nature of an attachment adapted to be secured to and removed fromthe tractor. In Figure 1, the tractor is indicated by the referencenumeral i@ -and consists of means il serving as a frame for supporting atractor motor i2 and having front wheels (not shown) and rear tractionwheels I3. The tractor also includes a transmission casing i5 includingthe usual gear connections and differential mechanism between the motori2 and the rear drive wheels i3. The housing i5 is provided with arearsection i6 from which right and left hand axle housings il' and i8extend and in which the driving axles 20 and 2i are journaled. The drivewheels i3 arev adjustably mounted on the axles t@ and 2i and are soarranged that their tread spacing may be varied according to conditions.

The two-wayl plow units adapted to be attached to the tractor lil areindicated in Figure 2 by the reference numerals 25 and 26 and aresimilar in allJ'espects except that the plow bottoms of the two unitsare shaped. to throw furrows in opposite directions. Each unit comprisesa plow beam 21 shaped as best shown in Figure 1 and carrying a plowbottom or furrow opener 28 at its rear end. Approximately mid-way of thefront and rear ends of the tractor frame il is a transversely disposeddraft bar 36 to which the forward ends of the tool -beams 2l areconnected as will be described later. The draft bar or beam 3@ ispreferably of channel section having substantially vertical flanges towhich attaching plates 3i and 32 are secured at opposite ends thereof,as by Welding or the like. The upper ends of these plates 3i and 32 areapertured to receive attaching bolts which are disposed in the lowerlooped sections 38 of a pair of. plates or bars 88 and 39 adjustablyfixed in vertically positioned slots or openings in a pair of bracketsd@ and di which are bolted to opposite sides of the tractor by means ofbolts 42 and 48. The means for adjustably xing the plates 38 and 39 inthe brackets 40 and 4| consist of a bolt 4S or the equivalent which isanchored at its lower end to the associated plate and which extendsupwardly through a perforation in a lug 41 extending outwardly andlaterally from the associated bracket. Nuts 48 and 49 threaded onto thebolt 46 and disposed on opposite sides ot the lug 41 serve to retainthese parts 2,012,458 the machine chosen to illustrate the principles ofin vertical adjustment. It will be understood, of course, that any othermeans for rigidly and adjustably connecting the draft bar or draft beam30 to the tractor may be utilized if desired.

The forward ends 'of the tool beams 2l are operatively connected withth'e transversely disposed draft bar 30 by connections providing forvertical and horizontal movement of the tool beams with respect to theWheeled supporting frame, namely, the tractor i0, which connections areso constructed and y arranged to prevent lateral swinging of theoperating unit which has been raised to inoperative position. Suchconnections will now be described. The forward end portion 21a. of eachof the tool beams 2l carries a pivot bolt 50 to which is secured a bellcrank 5i having a horizontally l.disposed and forwardly extending arm 52pivotally connected to the bifurcated end 53 of a draft rod or plunger55 slidingly disposed in perforations in the depending flanges of thedraft bar or draft beam 30. Preferably, the connection between theforward end of the bell crank arm 52 and the rear end of the plunger 55consists of a pivot bolt or pivot pin 5l. A compression spring SD isdisposed on the plunger 55 forwardly of the draft beam 30 and isconfined between the forward ange of the latter and an adjusting nut 6lthreaded on the front end of the plunger 55.

A laterally extending framework t5 is rigidly connected with the forwardend-portion 27a of each of the tool beams 2l, andi this inwardly eX-tending framework 65'consists of members 5l and t8 suitably bolted orriveted together and to the tool beam 2l in-any desired manner. 'Iheforwardmost end of the member @l extends to a point in lateral alignmentwith the forward end of the bell crank arm 52 and is bent, as best shownin Figure 2, so as to extend in parallelism therewith. This end of themember tl is apertured to receive a pivot pin or bolt lil which iscarried by the rear bifurcated end li of an inner draft rod or plunger13. Like 'the draft rod or plunger 55, the plungers 13 extend throughperforations in the central portion of the draft bar 30, and springmeans i5 embraces the forward ends of the plungers 13 and are confinedbetween the forward flange of the draft bar 30 and adjusting nuts 'i6threaded onto the plungers 73.

Since the right and left hand plow or implement units are substantiallyidentical, the same or similar parts have been indicated by identicalreference numerals.

The above described `hitch connections are preferably such that thespring means l is made sufficiently strong and heavy so as to transmitpractically all of the pulling load of the tractor to the plow-body orfurrow opener 28, the pivot connections ill being made loose enough topermit some lateral swinging of the tool beam 2l when in operativeposition'. The companion spring means 60 is considerably weaker than thespring means i5 so that lateral swinging of the tool beam 2l inoperative position, responsive to changes in the direction of the lineof draft caused by steering the tractor or when the center of load onthe plow unit shifts, as when striking a rock on one side, is permitted,but the spring means 50 is made sufficiently strong to prevent thelateral swinging of the plow when in raised position or when the plowunit has been lifted enough to bring the plow body out of engagementwith the ground. In other words, under the influence of changes in theline of draft, the tool beam 2l in operative or working position swingsabout the pivot point 10, the corresponding movement of the end of thelbell crank arm 52 being accomm dated by the yielding of the relativelyweak spring means 60 while the spring means I5 is effective to transmitpractically all of the draft forces to the tool beam 21 through theframe member 61. j

However, when the implement tool beam has been raised, the spring means60 becomes immediately effective to swing the tool beam laterallyoutwardly of its supporting frame, namely. the tractor, to a pcsitionoutof the way of the opposite tool beam so as to permit the latter to'haverela.- tively unrestricted lateral movement about its hitch point l0.

It is to be noted that each of the plow units isconnected with thetransversely disposed draft bar or draft beam 30 at two laterally spacedpoints, at one of which the draft transmitting means is disposed whileat the other point the biased means is disposed for swinging the toolbeam to a given lateral position when it has been raised out of groundengaging position. It will also be noted that only the laterallyouterpoints, namely, 5l', are provided with the bell cranks 5|. The functionof the bell cranks 5| is to level the plow unit. The connections bywhich this is a/ccomplished will now be described.

Each of the bell cranks 5| includes an upwardly disposed arm 80 to whicha generally longitudinally extending link 8| is connected, the rear endof the link 8| being connected to an adjusting lever 83 pivotallysupported, as at 84', on a sector t5 rigidly supported from theassociated plow beam 21. Suitable latch mechanism 81 is provided and,cooperates with a toothed portion of the sector 85 to retain theadjusting lever 83 in any given position. By releasing the latchmechanism 81 and swinging the lever 83, the bell crank 5| may beadjusted to raise or lower the hitch point 50 at which the forward end21a of the associated tool beam 21 is connected. Since the laterallyinner portion of the framework 65 secured to the tool beam 21 isconnected directly to the inner draft plunger 13, the verticaladjustment of the point 50 serves to level the unit. Each of the units25 and 2B is provided with such an adjusting mechanism, and hence adescription of one will suflice.

The tractor is provided with power lift mechanism |00 embodying ahousing |0| (see Figure 1) from which extend rtwo laterally directedtubular members |02 and |03 that support and enclose an actuating rockshaft means having at its outer ends arms |06 and |01, respectively.Suitable one-cycle or half revolution clutch mechanism is disposedwithin the housing |0| and operatively connected -to the gearingcontained in the transmission housing I5. Such clutch mechanism iscontrolled by means of a trip lever ||0. Actuatlon of the lever ||0serves to rock the shaft or shafts |05 to raise and lower the implementplow units. The present invention is not concerned with the particulardetails of the power lift clutch and hence the same has not beencompletely illustrated in the drawings. It is to be understood,therefore,

that the present invention contemplates any formof power lift clutch forrocking the rock shaft |05. Preferably, however, the Apower liftmechanism |0| is of such construction that the rock shaft |05 is rockedfirst in one direction thru an angle of about 45 and then back again toits original position.

The lifting connections between the rock shaft arms |06 and |01 and theplow units include links H5 pivotally connected to thefouter'ends of thearms |06 and |01 and to the tool beams 21, as at ||1. Preferably, eachof the lifting arms |06 and |01 comprises a pair of plates |20 and |2|riveted or otherwise secured together at their outer ends, as by aspacer 22, and journaled at their inner ends on cylindrical portions ofa casting |23 bolted, as at |25, over the squared end of the rock shaft|05. The two plates |20 and |2i are fastened together intermediate theirends by a spacer member |21. The casting |23 includes a lug portion |30which is disposed underneath the two arm sections |20 and |2| so thatwhenever the rock shaft |05 is rocked in a clockwise direction as viewedin Figures l, 3 and 4, the lifting arm will be rocked therewith, the lugportion |30 abutting against the lower edges of the plates or armsections |20 and |2l. By virtue of this construction, however, the rockshaft |05 may be rocked in a counterclockwise direction without causingthe lifting arm |06 to move therewith, the lug portion |30 merelymoving` away from the lower edge of the plates |20 and |2|, as will bereferred to later.

The spacing member |21 is utilized for pivotally connecting a link |40to the two plates |20 and |2| of the lifting arm |05, and in a, similarmanner, the member |22, which is als-oa spacer,

serves to pivotally connect the upper end of the link i I5 with theouter end of the arm |06. A

second link member IM is pivotally connected, as at |42, with the link||5 at a point intermedlate the ends thereof. The llink member Ulicomprises two links or straps |43 and |44,as bestvshown in Figure 5,these links being disposed on opposite sides of the link member ||5 andwithin a sie 4,5 formed in the outer end of the .link.,.lauandtheoutermost portions of the links |03 a'f'ndtit are riveted together, asat |50, to providea1 convenient actuating handle |5|.

The link members and I ill constitute, in effect, toggle links and areoperative when locked to x thearm |06 and link I5 in position to holdthe tool beam 21 associated therewith in elevated relation. The links|40 and MI are shown in their over-center or locked relation in' Figure3 from which 'it will be observed that the pivot connection is disposedto the right of the line joining the pivots |42 and |21. By virtue ofthis relation the weight of the implement 21 being transmitted throughthe links ||5 and |4| to the link itil-establishes a couple acting torotate the toggle link |40 in a, clockwise direction as viewed in Figure3. This .rotation is prevented, however, by virtue of the contactbetween the curved section of the link memr |4| and the rivet |21, asbestshown in Figures 3 and 5. It will thus be apparent that by rigidlyconnecting the pivotl points |21 and |42, the'link H5 and the arm |06are fixed in a given angular position so that the weight of the raisedtool beam is transmitted thereby to the cylindrical portion of thecasting |23 `mounted on the rock shaft |05.

The toggle lock IAD-IM just described may be broken by rocking thehandle 5| rearwardhr, or in a counterclockwise direction as Viewed inFigure 3. Moving the handle |5| in this manner will shift the pivot 5tothe left of theline joining the pivots |02 and |21, the weight of thetool beam 21 then becoming effective to extend the |06 and associatedparts to the position shown in Figure 4, which is'the working positionfor the plow bodies or other tools carried by the beam 21.

In order to raise the tool beam to the position shown in Figure 3, thetrip lever I|0 is actuated and the associated clutch mechanism causesthe partial rotation of the power lift shaft |05 in a clockwisedirection as viewed in Figure 4. By virtue of this movement, the lug |30abuts the lower edges of the plates |20 and |2`| making up the liftingarm |06, thus swinging the arm |00 upwardly .as the rock shaft |05 isrocked in a clockwise direction. This upward'movement of the arm |06acts through the link H5 to raise the beam |21. During this movement,the upward movement of the link H5 raises the toggle link Ili and swingsthe toggle link |40 upwardly to substantially the position shown inFigure 3. In order to insure that the toggle links M0 and |4|| willbecome locked, a spring |00 is anchored to a bracket |6| carried at thelower end of the link ill. 'I'he spring |60 is also anchored to an eyebolt |63 adjustably fixed, as at its, in a bracket fixed to theupper endof the link i0. Thus, as the toggle link |40 is swung upwardlyapproaching the position shown in Figure 3, the tension of the spring|60 is sufiicient to swing the link iti in a clockwise direction asviewed in Figure 3 so as to dispose the pivot |05 to the right of theline joining the pivots |42 and |21. The slot |650 in the link |50permits this additional movement and, in addition, permits a limitedamount of vertical movement of the tool beam 21 and the links it@ and IMwithout unduly swinging the handle |55.

Whenever the rock shaft|05 is rotated to the position shown in Figure 3,both of the plow units will be lifted to a raised position and will beautomatically locked in their raised position by the toggle mechanismjust described. Preparatory to dropping either of the plow units, thepower liit is operated again to cause the rock shaft |05 to rotate backto the position shown in Figure 4, thus rotating the lug |30 on each ofthe castings |23 away from the lifting arms |00 and |00. Then, to dropeither of the plows, the lever iti for` that plow is pulled rearwardlythus unlocking the over-center or toggle lock and permitting theassociated lifting arm to rotate back to the position shown in Figure 4.

The connection of the links i i5 and of the links |40 with the liftingarms |06 and i0? are made loose so as not to interfere withthe lateralswing` ing of the plow units. The provision of the slots |40 alsoprovides for any manufacturing inaccuracies in the links and associatedparts.

Figures 6 to 12, inclusive, illustrate another formy of `constructionembodying certain of the principles of the present invention referred toabove'and of the features many of which may, if desired, be applied tothe construction shown in Figures 1 to 5, inclusive. Primarily, however,the construction shown in Figures l to 5 is particularly adapted .to beassociated with tractors or the like -bhaving a live axle constructionwhile the form of machine' shown in Figures 6 to i2.is particularlyadapted to be associated with a wide tread tractor or the like having anarched axle. Referring now to the latter figures, two substantiallyidentical plow units 200 and '20| are provided, each of the unitsincluding a tool beam 203 which has a bracket 20d fixed to its forwardend and connected, as by U-bolts 205, to a U-shaped bracket 206. Each ofthe brackets 200 is connected to the draw bar 201 of the tractor |0a attwo laterally spaced points 2I0 and 2| i, these points being 75/l/established by means of pivot pins or studs carried by the bifurcatedrear ends of .draft bolts or plungers 2li slidingly supported inU-shaped brackets 2l6 bolted or otherwise secured, as at 2 I1, to thetractor draw bar 201. The draft bolts or plungers 2li have springs 2|!and 2|! associated therewith and so constructed and arranged as tofunction in the same manner as the spring means 60 and 15 describedabove.

In order to eiect the hitch connection just described, the draw bar 201is preferably disposed in a reverse position, being connected with thedrive housings of the tractor |0a as will now be described. The draw bar201 of the tractor is rockably supported thereon for vertical movementabout a transverse axis to provide for raising and lowering the hitchpoint of the tool beams 003, the latter being provided with plow bodies20 as in Athe previously described modification. In order to have theaxis about which the draw bar 000 rocks intersect the line of draft toeach plow, the draw bar 200 is provided with a bracket 200 xedlyconnected thereto or carried thereby by means of a bolt 02 passingthroughthe forward portion of the bracket 220 and the correspondingsection of the draw bar 201i and by lugs 202 and 22s formed integralywith the bracket 020 and bearing on the opposite edges of the draw bar001, as best shown in Figure ii.

The tractor' 60a includes generally downwardly extending drive housings225 provided with at taching lugs 22d formed thereon or carried thereby.To each lug a depending bracket 200 is piv= oted, as by means o a bolt20|, but the depending bracket 220 is held rigid withrespect to thetractor by means of 'a tie link 00d having a iorward inturned end 200extending through an opening in the lower portion oi the bracket dit andalso through an opening inthe lower portion of the draw bar bracket 03dand secured. in position by means of a cotter key 230 or the equivalent.The rear end 200 of the tie link 23d is disposed in one of the openings230 in a lug 2M formed on the drive housing 22d. Ii' desired, theforward lug 220 on the drive housing may also be provided with aplurality of two lor more openings to receive the boit 00| in variouspositions. The forward inturned end 230 of the tie link 230, inconnection with the companion tie link on the other side of the machine,defines the pivot axis about which the tractor draw bar 201 swings ineiecting adjustment as to the height of hitch for the tool beams 200. Byvirtue of the depending plate or bracket 220 and the bracket 220 on thedraw bar, this axis can be disposed substantially in the line of draftfrom the tractor to the plow body in working position.

The plow units 203 are leveled by an arrangement which is similar inymany respects to the means for` the same purpose described above. Theoutermost portion o' the U-shaped bracket 206 is provided with a bellcrank 240 having an arm portion 240 connected with the pivot 2|3 and asecond arm portion 241 connected with a longitudinally extending link230. The rear portion of the tool beam 203 carries a sector 26| to whichis pivoted an adjusting lever 203, as at 250, -the lower-end of thelever 253 being connected, as at 250, with the rear end of the link 200.Swinging the adjusting lever 233 will rock the bell crank 205, causingthe latter to iulcrum about the pivot 2|0 to raise and lower the forwardand outer portion ot the tool beam 203, thereby leveling the' plow body23 carried thereby. Each of the plow units is provided with this form ofleveling means.

The rear end portions 259 of the draw bar 201 are connected by means oflinks 260 and 26| with forwardly extending arms 263r and 264 secured toor carried by a transversely disposed rock shaft 265 supported forrocking movement in a pair of laterally spaced brackets 261 and 268.These brackets are fixed, as by welding or the like, to a U-shaped angleiron support 210 disposed in a vertical position and secured, as bybolts 21|, to the chain housings or drive housings 225 of the tractor.

The rock shaft 265 is rocked by means of an adjusting lever 215 fixedadjacent one end of the rock shaft, as by being bolted or otherwisesecured to a casting 216 mounted on a squared end 211 of the rock shaft.The adjusting lever 211 includes the usual detent mechanism 280cooperating with a sector 28| xed to the bracket 258, as best shown inFigure 8. By rocking the lever 215, the draw bar 201 may be rocked aboutits pivots 235 to raise or lower the hitch points 2|0 and 2|| for thetool beams 203.

The plow units 200 and 20| are raised to inoperative position throughlifting connections which include parts mounted on the rock shaft 265.Such connections include a pipe or tubular member 300 journaled over therock shaft 265, as best shown in Figure 8, and are provided with an arm30| fixed thereto, as by welding or the like, and link connected, as bya link member 302, to a pendulum link 303 mounted on the tractor, asbest shown in Figure 7, and rocked by means of a connection 305 with thepower lift 306 of the tractor. Each of the tool beams 203 is connectedby a chain 3|0 with an arm 3|| v journaled on one end of. the tubularpipe member 300. Each of the arms 3|| is confined between the associatedbrackets 261 or 268, and a collar 3|2 fixed to the pipe member 300, asby welding or the like. Each of the collars 3|2 has an arm portion 3|5formed integral therewith or carried thereby and having a laterallyextending lug 316 adapted to engage the underside of the associatedlifting arm 3| l.

By virtue of this construction, as best illustrated in Figures 9 and 10,whenever the tubular pipe member 300 is rocked, as by actuation of thepower lift 306 of the tractor, in a counterclockwise direction from theposition shown in Figure 9 to the position shown in Figure 10, thelifting arms 3|| are elevated, thereby lifting either or both of theplows 203.

Locking mechanism is provided for holding either or both of the liftingarms 3|! in elevated position independently of the subsequent rocking ofthe lugs 3|6 back to their position shown in Figure 9. Such rockingmechanism includes toggle links similar in many respects to the togglelock means described above. One of the toggle links is indicated inFigures 9 and -10 by the reference numeral 320 and is pivotallyconnected, as at 32|, with the associated lifting arm 31|. The otherlink 322 is provided with a pivot bolt 323 received within a slot 325formed in the outer end of the toggle link 320. The other toggle link322 is pivotally supported at 321 on a stationary bracket 329, which maybe a portion of one of the brackets 261 and 268. The toggle link 322 isoffset, as at' 330, to permit the-pivot 323 to rotate below the lineconnecting the pivots 32| and 321, as best shown in Figure 10, wherebythe associated lifting arm 3|| is locked in raised position. The slottedconstruction 325 provides for the movement of the toggle links to theirover-center relation and also accommodates manufacturing inaccuracies ofthese links. Each of the links 322 is biased for movement toward itslocked position by means of a spring 332 connected with the arm at oneend and anchored at its other end to a lug 333. A

Each of the toggle links 332 has a forward section 335 which terminatesin a pedal 336. By stepping on the pedal 336, the associated link 322will be rocked upwardly about its pivot 321 to release the toggle lockand permit the associated tool beam 203 to drop.

To aid the power lift in raising the plow units 203, a lifting spring340 has been provided and is secured at its rear end to an extension 34|formed on one of the arms 3|5. The forward end of the lifting spring 340is anchored to a. bracket 342 which embraces the right hand tubular axlehousing or quill |8a of the tractor |0 and is formed to hook in backof'a flange 3&5 thereon, as best shown in Figure 7.

While have shown and described above the preferred constructions inwhich the principles of the present invention have been embodied, it isto be understood that my invention is not to be limited to the specicdetails shown and described above, but that,'in fact, widely differentmeans may be employed in the practice of the broader aspects of myinvention.

What I claim, therefore, and desire to secure by Letters Patent is:

1. An agricultural implement comprising a supporting frame, a tool beammovably connected in draft receiving relation therewith and shiftable todifferent positions with respect thereto under the inuence of theapplication of draft thereto, and biased means providing forsubstantially unrestrained movement of said beam under the draft forcesapplied thereto but having suicient bias after said draft forces areremoved to automatically shift'said tool beam back to one of itspositions and hold the beam in that position.

2 An agricultural implement comprising a supporting frame, a tool beammovably connected therewithfor vertical and horizontal movement andprovided with ground engaging tool means, and biased means operatively.connected with the tool beam and providing for lateral movement thereofunder the influence of normal draft forces applied to said tool meanswhen in ground engaging position but having sufficient strength toautomatically shift said tool beam laterally of the frame when said toolmeans is raised out of ground engaging position.

3. An agricultural implement comprising a supporting frame, a tool beammovably connected with the frame and including a ground engaging toolshiftable into and out of ground engaging position, means connecting thetool beam with said frame and serving to establish an effective hitchpoint near the center of the frame, and biased means adapted to yieldunder the application of normal draft forces applied to said groundengaging tool when the latter is in its ground engaging position andacting to swing said tool beam laterally outwardly of said frame onlywhen the tool beam is shifted out of ground engaging position.

4'. An agricultural implement comprising a supporting frame, a tool beammovably connected with the frame and including a ground engaging toolshiftable into and out of ground engaging position, 'means servingl as agenerally transversely extending draft bar on the frame, e. pair oflaterallyspaced generally longitudinally the tool beam to swinglaterally when said toolextending draft members carried by the tool beamand adapted to be attached to saidv draft means at laterally spacedpoints thereon, and relatively lightspring means connecting one of saiddraft members with said draft bar means and providing for lateralmovement of said tool beam `about the point of attachment with thevvother of said draft members under the influence of normal draft forcesapplied to said ground engaging tool, said relatively light spring meanscausing is out of ground engaging position.

5. An agricultural implement comprising a supporting frame, -a tool beammovably connected with the frame and including a ground engaging to olshiftable into and out of ground engaging position, means serving as agenerally transversely extending draft bar on the frame, a pair oflaterally spaced generally longitudinally `extending draft memberscarried by the tool beam and adapted to be attached to said draft meansat laterally spaced points thereon, spring means connecting said draftmembers with said draft bar means, and means for moving said tool beamout of ground engaging position, one of said spring means being arrangedto transmit the major portion of the draft to the tool beam and theother of said spring means being arranged to shift the tool beamlaterally only after it has been shifted out of ground engagingposition.

6. In combination, a supporting frame, a soil Iengaging unit, and meansconnecting said unit with said frame comprising spring means of sumcientstrength to transmit the draft force from said frame to said unit and a.second relatively weak spring means spaced laterally from said firstspring means and providing for the lateral swinging of the`V unit inresponse to lateral shifting of the line of draft, said second springmeans being sumciently strong to prevent lateral swinging of the unitwhen shifted into an inoperative position.

7. In combination, a wheel supported frame, a

plow unit, means connecting said plow unit to' said frame comprising aspring of sumcient strength to transmit the draft force from. said frameto said plow unit and a second relatively weak spring spaced laterallyfrom said first spring permitting said plow unit to swing laterallyresponsive to lateral yshifting `of the line of draft, said secondspring being sufficiently strong to prevent lateral swinging of the plowunit when raised into an inoperative position, and means for raising theplow. unit into an inoperative position.

8. The combination with a supporting frame and an implement unit movablyconnected with said frame for relative movement, of an arm rockablymounted on said frame, a link pivotally connected with sai'd arm andwith said unit, means for rocking said arm to shift said unit to oneposition, and means for releasably locking said link to said arm whensaid arm is rocked to shift the unit .to said position to therebyprevent said arm from rocking and to hold the unit in said position.

9. The combination with a wheeled frame and a plow unit plvotallyconnected-to said frame for vertical movement, of an arm rockablymounted on said frame, alink plvotally connectedto said arm and to saidplow unit, means for rocking said arm to raise said plow unit to aninoperative v position, and means for releasably locking said link tosaid arm when saidy armis rocked to raise the plow unit to prevent saidarm from rocking back to its first position.

10. An agricultural implement comprising a supporting frame adapted tohave a tool beam plvotally connected therewith for generally verticalmovement, a rockably mounted member on the frame, a second membermovably mounted with respect to the frame and adapted to be operativelyconnected with said tool beam to raise the same, a pair of toggle linksplvotally connected together by lost motion means and at least one ofsaid toggle links being connected to one of said members,l said togglelinks being operative when swung to an over-center position to hold saidmembers against relative movement in at least one direction to'retainsaid tool beam in a raised position, means connecting said one togglelink with said one member for relative pivotal movement, the othertoggle link being adapted to engage said means to define said overcenterposition, and spring means cooperating with one of said toggle links andoperative to move said toggle links into said position.

1l. An agricultural implement comprising a supporting frame, a generallytransversely disposed draft bar, a pairv ofv laterally spaced brackets'carried by said frame and including slotted porbar.

12. An agricultural implement comprising a supporting frame, a generallytransversely disposed draft bar, a pair of laterally spaced bracketscarried by said frame and including slotted portions, movably mountedplate members connected, respectively, with said slotted portions andsecured to said draft bar, means adjustably securing said plates to saidbrackets to fix the position of said draft bar with respect to saidframe, 'draft connections carried by said draft bar and includingswingably mounted bell cranks, operating units connected with said bellcranks, and means connected with said bell cranks for adjusting theposition of the forward .ends of said operating units. l

13. The combination 'with a tractor having a draft bar mounted forvertical movement with respect to the tractor and an implement connectedto said draft bar for vertical movement, of a rock shaft, connectionsbetween said rock shaft, and said draft bar whereby rocking of the adepending bracket plvotally connected with each of said lugs, rearwardlyextending link means. a connected with the lower portion of saidbrackets and anchored to said drive housings for fixing the position ofsaid brackets, a pair of vbrackets rigidly carried by said draw bar andplvotally mounted on the forward portion of said link means, and meansconnected with said draw bar for swinging the same vertically.

15. An agricultural implement comprising a supporting frame, a tool beammovably connected with the frame and includingA a ground engaging lylight spring means causing they-tool beam to4 swing laterally when saidtool is out of ground engaging position.

16. In combination, a supporting frame, a soil engaging unit, and meansconnecting said unit with said frame for lateral pivoting and comprisingdraft -transmitting means for transmitting the draft force from saidframe to said unit and a relatively weak spring means spaced laterallyfrom said draft transmitting means and providing foxthe lateral swingingof theunlt in response to lateral shifting of the line of draft` saidspring means being sufficiently strong to prevent laterel swinging ofthe unit when shifted into an inoperative position. l

17. The combination with a supporting frame and an implement unitmovably connected with said frame for relative movement, of an armrockably mounted on said frame, means connecting said arm with saidunit, means for rocking said arm to shift said unit to one position, and

means connected with said unit and said armand operative, when said armis rocked to shift the unit to said one position, for releasably lockingthe unit in said position.

18. The combination with a supporting frame and an implement unitmovably connected with said frame for relative movement, of an armrockably mounted on said frame, means connecting said arm with saidunit, means for rocking said arm to shift said unit to one position, and

means including toggle mechanism reacting against said unit and saidsupporting frame and moved into over-center relation when said arm isrocked to shift the unit to said position for releasably holding theunit in said position.

19. The combination with a supporting frame and an implement uni-tmovably connected with said frame for relative movement, of an armrockably mounted on said frame, means connecting said arm with saidunit, means for rocking said arm to shift said unit to one position.means including toggle mechanism reacting against said unl-t and saidsupporting frame andY moved into over-center relation when said arm isrocked to shift the unit to said position for releasably holdlng theunit in said position, and means tending tol shift said toggle mechanisminto its overcenter position when said unit is in said one position.

20. The combination with a supporting frame with said implement unit,and means connected between said unit and said lifting mechanism in-`dependently of said link means for releasably locking said implementunit in raised posi-tion.

21. The combination with a supporting frame and an implement unitmovably connected with said frame for relative movement, of implementlifting mechanism` carried by said frame and including a pivotallymounted arm, link means serving Ito connect said arm with said implementunit, and means connected with said implement unit and arm independentlyof said link means for releasably locking said implement unitl inVraised position, one of the points of connection of said last namedmeans being spaced from the associated poin-t of connection of said linkmeans.

CARL G. STRANDLUND.

